Engine-stop.



No. 746,672. PATENTED DBG. 15, 1903.

J. H. GARY.

ENGINE STOP.

APPLIQATION FILED JULY 28. 1902. No MODEL. 2 SHEETS-SHEET l.

Lmw wAsmNsmN u c J. H. CARY.

ENGINE STOP.

APPLIOATION ULEB JULY 2B. 1902.

2 SHEETS-SHEET 2- 'No MODEL.

/N//EN T09,

irry.

/fV/ TNESSES,

TH: Nonms PETERS co, vuoaumu. msmzo'rrm. D. c.

UNITED STATES Patented December 15, 1903.

PATENT OFFICE.

JAMES H. CARY, OE PROVIDENCE, RHODE ISLAND, ASSIGNOR TO CONSOLI- DATED ENGINE-STOP COMPANY, A CORPORATION OE CONNECTICUT.

ENGINE-STOP.

SPECIFICATION forming part of Letters Patent No. 746,672, dated December 15, 1903.

Application filed July Z8, 1902. Serial No. 117,289. (No model.)

To all whom t may concern:

Be it known that I, JAMES H. CARY, a citi- Zen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Engine-Stops, of which the following is a specification.

My invention relates to electrically-controlled mechanism for stopping engines sud- Io denly in cases of emergency.

My object is to check an engine from a remote point, if necessary, by closing the engine throttle-valve electrically through the medium of a motor. This end I attain by the I5 novel construction and arrangement of parts set forth herein and illustrated by the accompanying drawings, wherein- Figure l is a side elevation of a motor and throttle-valve, together with a diagrammatic view of the electric circuit, which combined embody my invention; Fig. 2, a side elevation of the throttle-valve, taken from another point of observation, including a face View of the rheostat; Eig. 3, a detail view of the z5 blade and its contact-points; Figs. 4 and 5, face views of the rheostat in open and closed positions, respectively.

Like characters of reference indicate like parts throughout the views.

In connection with the reference-letters my mechanism may be described as follows:

An electrical circuit comprising wires l, 2, 3, 4, 7, 8, 9, 10, l1, 12, 13, and 14 is supplied with a current furnished by a battery or generator a. That portion of the circuit comprising the wires 2, 3, and 4 includes an electromagnet h and an electromechanical gong c. The wires 1 and 4 are normally open, but are manually closed by contacting the keys o d. Wires 5 and 6 connect the resistance-coil e with the circuit wherein are the keys d. The electromagnet h rests upon the framef of a gravity-drop. To one extremity of this frame is pivoted an armature-lever g, carrying upon one extremityra weight h and upon the other a hook 0l. To the other extremity of the framefis pivoted a gravity-dropj, comprising a curved arm k, terminating in a hook l, which normally engages the hook t' on the 5o armature-lever, also a blade m, adapted to fall between the contact-points n intermediate the wires 7 and 8 of the circuit.

Mounted upon any convenient base o and in the main circuit intermediate the wires S and 9 is an electric motor II, whose armature- 55 shaft p carries a pinion q, meshing with a toothed wheel r, which is mounted upon a shaft s parallel to the shaft of the armature. Also xedly mounted to the shaft s is a sprocket-wheel t.

Referring now to the throttle-valve u, its laterally-projecting threaded spindle o, supported by a bracket w, has keyed to its extremity a hand-wheel I and the hub y of a sprocket-wheel Qc, provided with an exterior flange e. The sprocket-wheels t and :t are connected by the sprocket-chain s'. Mounted in a vertical position below the threaded spindle and in alinement therewith is a rheostat-frame a,to whose face is pivoted a switch- 7o lever b', carrying upon its upper extremity and insulated therefrom by the strips g' the jaws c', which engage the flange e. The free end of the switch-lever is adapted to contact with any one of the usual segments d d2 75 d3 d4, provided with their respective intermediate resstance-coils formed in a portion of the circuit-wire 14. An insulated block e projects from the free end of the switchlevel` b, adapted when said arm is at the ex- 8o treme of its travel to trip a catch f, pivoted to the frame a. Diagonally below the catch is also pivoted` to the frame a gravity-drop h', whose free end is provided with a hook t, normally engaging the catch f and during engagement contacting with aspringj', which forms the terminal of the circuit-wire l0. The circuit, however, is continued through the wire 13, terminating in the pivot T of the switch-lever. The downward travel of the 9o gravity-arm is accentuated by the tension of a spring c, connecting said arm just above its pivotal point.

Besides the keys d one or more additional keys may be inserted in the circuit4as, for 95 instance, the keys Z', shown intermediate the wires 11 and 12. The single-point switch m', shown near the keys Z', may be substituted for the latter, if preferred, as it performs a germane function.

IOO

The operation of my device is as follows: When it is desired to stop the engine, any set of keys may be manually closed, as at d, whereby the current in the circuit composed of wires l 2 3 4 energizes the magnet Z9, depressing the armature-lever g and releasing the hookt' from the hook Z of the gravitydrop k, whereby the switch-lever m falls intermediate the contact-points n. It may be further remarked concerning this portion of the circuit that the contacting of the keys CZ shunts the resistance-coil e, which is of so much higher resistance than the apparatus to be actuated that the major portion of the current travels through the said apparatus. Another feature is that lthe gong c acts when the above circuit is broken. The operations above described close the main circuit, comprising roughly the wire '7, the battery-wire l0, the rheostat-Wire 9, motor H, and wire 8. The latter wire, upon the movement of closure above described, operates the motor H, which through the pinion q, toothed wheel fr, sprocket-wheel t, and chain a', rotates the sprocket a; and the threaded spindle fu, to which it. is keyed. As the spindle o advances into the throttle-Valve u it cuts off the passage of the steam therethrough, thus stopping the engine. While the hub y is approaching the throttle-valve tt, however, as described, the flange e' is constantly turning the switch-lever b upon its pivot from the closed position, Fig. 5, to the open position shown in Fig. 4, wherein it is seen that the block e trips the block f', releases the lever h', and severing its contact with the spring j breaks the circuit and stops further movement of the spindle t.

An important feature of the present invention resides in the employment of the rheostat and arranging the same to first introduce a high resistance to insure a slow starting of the motor and then gradually decreasing the resistance to effect an increase in the speed of the motor, and nally causing the automatic opening of the main circuit when the switch-lever of the rheostat is moved to its extreme limit in the direction of decreasing the resistance. By this arrangement there is no danger of injuring the motor and the valve by a quick starting of the motor.

If the operator desires to effect merely a reduction of the volume of steam passing through the valve u, he may by applying a continuous pressure upon the keys Z effect this end independent of the auxiliary circuit l 2 3 4 when the latter circuit is in its illustrated open position. Should the operator prefer, he may completely stop the engine by instantly moving the switch m', and the automatic action above described will effect a complete stoppage of the engine.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In an apparatus of the class described, the combination with a normally open main circuit including controlling means, of an auxiliary circuit including a magnet, an armature-lever within the field of the magnet, a gravity-drop engaging the armature-lever and adapted to close the main circuit when released therefrom, and means for closing the auxiliary circuit.

2. In an apparatus of the class described, the combination with a normally open main circuit including controlling means, of an auxiliary circuit including an electromagnet, a frame for said magnet, an armature-lever pivoted to the frame adjacent to and actuated by the electromagnet, a gravity-drop pivoted to the frame and adapted to close the main circuit when released from said armature-lever, a hooked arm upon the gravity-drop normally engaging the armature-lever, and keys for closing the auxiliary circuit.

3. In an apparatus of the class described, the combination with a normally open main circuit including controlling means, of an auxiliary circuit including an electromagnet, a frame for said magnet, an armature-lever pivoted to the frame adjacent to and actuated by the electromagnet, a gravity-drop pivoted to the frame and adapted to close the main circuit when released from the armature-lever, a hooked arm upon the gravity-drop normally engaging the armature-lever, keys for closing the auxiliary circuit, a resistance-coil around said keys, and an alarm also included in the auxiliary circuit.

4. In an apparatus of the class described, the combination with an electric circuit including a source of energy, of a motor in the circuit, a rotary element to be driven, gear connections between the element and motor, a rheostat included in the circuit and including a lever, a connection between the lever and rotary element, means actuated by the rheostat-levelI for breaking the circuit, and means for closing the circuit.

5. In an apparatus of the class described, the combination with an electric circuit including a source of electrical energy, of an electric motor in the circuit, a rotary screw element to be driven, a sprocket-wheel geared to the motor, and the sprocket-wheel mounted on the screw, a chain connecting said wheels, a rheostat in the circuit and includinga swinging lever connected to and actuated by the screw element, means carried by the lever for breaking the circuit, and manually-controlled means for closing the circuit.

6. In an apparatus of the class described, the combination with an electric circuit, of a revoluble and lon gitudinally-movable driven spindle, a sprocket-wheel mounted on the spindle, a motor in the circuit for rotating the wheel, a flange also upon the spindle, a rheostat in the circuit including a pivoted switch-lever, insulated jaws upon the upper extremity of the switch-lever engaging the iiange, an insulated block upon the switchlever, a pivotally-supported catch within the radial travel of the block, a pivoted lever en- IOO Igo

gaging the catch, and a spring normally contacting with the lever to complete the circuit. 7. In an apparatus of the class described, the combination with a member to be actuated, of a normally open main electric circuit, an electric motor included in the main circuit and having an operating` connection with said member, a normally open auxiliary circuit comprising meansV for closing the main circuit, a normally set and closed circuitbreaker included in the main circuit, and a rheostat also included in the main circuit and Whose movable element is operated by said member to be actuated, said rlieostat comprising means for automatically opening the circuitbreaker when its movable element reaches its limit of action in one direction.

lWitnesses:

HoRATio E. BELLoWs, WILLIAM C. STANTON. 

